Audio Transformers

tr = pri : sec turns ratio

Shielded 600 Ω Input, Output & Line-to-Line 600 Ω Modem & Telephone

Input Transistor Driver Transistor Output Tube Output 70 Volt Line Misc.

The *** Impedance determined by measurement. notation identifies transformers for which no manufactures data was found and to determine spec's, a measurement was made to determine winding DC resistances and the open circuit turns ratio. The turns ratio provides an impedance ratio, but not the specific impedances the transformer was designed to provide and the listed values are simply what seemed most logical after trying various combinations and finding which provided, most closely, a 3 db output signal drop at 1KHz.

Shielded Transformers
1−5/8" x 1−5/8" x 2−1/8" H	Astatic LT-6 Microphone Line Matching Pri:30−50 / 150−250 Ω Sec: 40K Ω		NEW Qty: 4 $30 ea.
1−3/16" dia. x 7/8"	Hammond140Q Line To Line Pri:600 C.T. Sec: 600 C.T.		Qty: 1 $27
1−3/16" dia. x 7/8"	Hammond140Q Line To Line Pri:600 C.T. Sec: 600 C.T.	Hammond List $54.55
1−5/8" x 1−5/8" x 2−1/8"h	Merrimack Magnetics #1845 Line to Line - Isolation Transformer Pri:208 Ω C.T. DC Resistance - Not Impedance Sec: 280 Ω C.T. DC Resistance - Not Impedance *** Impedance still needs to be determined for this unit	1:1	Qty: 2 $30 ea.

600 Ω Input, Output & Line-to-Line
1/2" x 1/2" x 1/2"h	Hammond102D 600 Ω Line Input Pri:600 Ω Sec: 1500 Ω	20 mW	NEW Qty: 3 $25 ea.
1/2" x 1/2" x 1/2"h	Hammond102D 600 Ω Line Input Pri:600 Ω Sec: 1500 Ω	Hammond List $45.45
3/4"w x 5/8"d x 5/8"h	XX2 600 Ω Line Input Pri:600( 150 Ω DC Resistance ) Sec: 1800 C.T. ( 188 Ω DC Resistance ) *** Impedance determined by measurement.	1:1.5	NEW Qty: 1 $2
1"w x 3/4"d x 13/16"h	Hammond106E 600 Ω Line-Line Pri:600 C.T. Sec: 600 Ω	1:1 500 mW	Qty: 3 $25 ea.
1"w x 3/4"d x 13/16"h	Hammond106E 600 Ω Line-Line Pri:600 C.T. Sec: 600 Ω	Hammond List $45.45
3/4"w x 5/8"d x 5/8"h	XX1 600 Ω Line-Line Pri:600( 1.7 Ω DC Resistance ) Sec: 600 C.T. ( 5.5 Ω DC Resistance ) *** Impedance determined by measurement.	1:1	Qty: 1 $2
3/4"w x 5/8"d x 5/8"h	42TM-0166 Mouser 600 Ω Line-Line Pri:600 Ω C.T. Sec: 600 Ω C.T.	200 mW TM-016.pdf	Qty: 2 $2 ea.
1"w x 3/4"d x 13/16"h	Hammond149T 600 Ω Line-Line Pri:600 C.T. Sec: 600 C.T.	1 Watt	NEW Qty: 2 $12 ea.
1"w x 3/4"d x 13/16"h	Hammond149T 600 Ω Line-Line Pri:600 C.T. Sec: 600 C.T.	Hammond List $18.18
1−13/16"w x 1−9/16"d x 1−1/8"h	36-0019C 600 Ω Line-Line Pri:150 / 600 Ω Sec: 150 / 600 Ω	Schematic	Qty: 2 $10 ea.
3/4"w x 5/8"d x 5/8"h	423-001 600 Ω Line Output Pri:100( 153 Ω DC Resistance ) Sec: 600 C.T. ( 240 Ω DC Resistance ) *** Impedance determined by measurement.	1:2.5	Qty: 1 $1
9/16"w x 1/2"d x 7/16"h	RB-20132 600 Ω Line Output Pri:1200 Ω( 190 Ω DC Resistance ) Sec: 150/600 Ω ( 40 Ω Total DC Resistance ) *** Impedance determined by measurement.	1.6:1	Qty: 2 $1 ea.
5/8"w x 5/8"d x 9/16"h	T-A089 600 Ω Line Output Pri:1200 Ω( 76 Ω DC ) Sec: 150/600 Ω ( 17 Ω Total DC Resistance ) *** Impedance determined by measurement.	1.9:1	Qty: 1 $1

Modem & Telephone - 600 Ω

Primary is Line Side - Secondary is Device Side
Phone Line Coupling
3/4"w x 11/16"d x 5/8"h	Mode60-606 Telephone Pri:600 Ω Sec: 600 Ω C.T.	1:1	NEW Qty: 1 $3
1-1/16"w x 1"d x 13/16"h	Tele1 Telephone Pri:600 Ω (58 Ω DC Resistance) Sec: 600 Ω (75 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 2 $2 ea.
15/16"w x 3/4"d x 7/16"h	LB-1995-D1 Telephone Pri:600 Ω (44 Ω DC Resistance) Sec: 600 Ω (47 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 1 $2
Modem and/or Phone Line Coupling (Not sure which application these units were removed from)
5/8"w x 9/16"d x 7/16"h	110AH Telephone/Modem Pri:600 Ω (2.2 Ω DC Resistance) Sec: 600 Ω (2.2 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 1 $2
1"w x 13/16"d x 7/8"h	710-004-001 Telephone/Modem Pri:600 Ω (62 Ω DC Resistance) Sec: 300 Ω (48 Ω DC Resistance) *** Impedance determined by measurement.	1.3:1	Qty: 2 $2 ea.
3/4"w x 5/8"d x 7/16"h	74420005 / 4089MP Telephone/Modem Pri:600 Ω (58 Ω DC Resistance) Sec: 300 Ω (52 Ω DC Resistance) *** Impedance determined by measurement.	1.5:1	Qty: 2 $2 ea.
3/4"w x 5/8"d x 7/16"h	T9005V Telephone/Modem Pri:600 Ω ( 66 Ω DC Resistance) Sec: 600 Ω ( 83 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 4 $2 ea.
13/16"w x 3/4"d x 9/16"h	TL580M82 Telephone/Modem Pri:600 Ω(66 Ω DC Resistance) Sec: 600 Ω C.T. (50 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 1 $2
13/16"w x 3/4"d x 9/16"h	F90219 / 74420097NR00 Telephone/Modem Pri:600 Ω(3.6 Ω DC Resistance) Sec: 600 Ω C.T. (3.6 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 1 $2
3/4"w x 7/8"d x 5/8"h	XX10 Telephone/Modem Pri:600 Ω ( 100 Ω DC Resistance) Sec: 600 Ω ( 100 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 2 $2 ea.
Modem
1"w x 13/16"d x 7/8"h	MicrotranT3220 Modem Pri:600 Ω Sec: 600 / 600 Ω	7 dBm T3220 drawing	Qty: 1 $2
1"w x 29/32"d x 7/16"h	Midcom671-9372 Modem Pri:600 Ω Sec: 600 Ω	9372a.pdf 9372b.pdf 9372c.pdf	Qty: 1 $2
1"w x 3/4"d x 1/2"h	TamaraTTC-143 Modem Pri:600 Ω Sec: 600 Ω	TTC143.pdf	Qty: 1 $2
13/16"w x 3/4"d x 9/16"h	86032 Modem Pri:600 Ω ( 70 Ω DC Resistance) Sec: 600 Ω (188 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 1 $2
13/16"w x 3/4"d x 9/16"h	TTC-109 Modem Pri:600 Ω ( 70 Ω DC Resistance) Sec: 600 Ω (120 Ω DC Resistance) *** Impedance determined by measurement.	1:1	Qty: 2 $2
11/16" x 11/16" x 1/2"h	DatatronicLM-301-1 Modem Pri:600 Ω Sec: 600 Ω	LM-302.pdf	Qty: 1 $2

Input
	Sorry, Input Transformers have all been Sold

Transistor Driver
3/8" x 3/8" x 3/8"h	ArmacoAT23 Transistor Driver Pri:20K Ω Sec: 1K Ω		NEW Qty: 3 $2 ea.
13/16"w x 5/8"d x 5/8"h	X3 Transistor Driver Pri: 10K( 547 Ω DC Resistance ) Sec: 2K C.T. ( 200 Ω DC Resistance ) *** No Data Sheet found - Spec's determined by measurement.	2.23:1	Qty: 1 $1
9/16"w x 1/2"d x 7/16"h	XX5 Transistor Driver Pri:8K( 390 Ω DC Resistance ) Sec: 2K C.T. ( 160 Ω DC Resistance ) *** Impedance determined by measurement.	2:1	Qty: 1 $1
9/16"w x 1/2"d x 7/16"h	XX6 Transistor Driver Pri:8K( 430 Ω DC Resistance ) Sec: 2K C.T. ( 170 Ω DC Resistance ) *** Impedance determined by measurement.	2:1	Qty: 1 $1
3/4"w x 5/8"d x 9/16"h	TR3-T2 Transistor Driver Pri:4000 Ω ( 346 Ω DC Resistance ) Sec: 600 Ω ( 32 Ω DC Resistance ) *** Impedance determined by measurement.	2.5:1	Qty: 2 $1 ea.
3/4"w x 5/8"d x 5/8"h	XX9 Transistor Driver Pri:1200( 172 Ω DC Resistance ) Sec: 600 C.T. ( 100 Ω DC Resistance ) *** Impedance determined by measurement.	1:3.5	Qty: 1 $1
1"w x 3/4"d x 13/16"h	Hammond149C Transistor Driver Pri:160 Ω Sec: 20 / 80 Ω	200 mW	NEW Qty: 1 $12
1"w x 3/4"d x 13/16"h	Hammond149C Transistor Driver Pri:160 Ω Sec: 20 / 80 Ω	Hammond List $18.18
1-3/16"w x 1-1/16"d x 1-1/8"h	FBT-27B Transistor Driver Pri:20K Ω ( 800 Ω DC ) Sec: 100 Ω ( 7.2 Ω DC ) *** Impedance determined by measurement.	14:1 ≈ 1.5 Watt	Qty: 1 $1
1-1/8"w x 1"d x 1"h	T62-603H Transistor Driver Pri:2000 Ω( 160 Ω DC ) Sec: 300 / 300 Ω ( 15 / 15 Ω DC ) *** Impedance determined by measurement.	3.5:1 3.5:1 ≈ 1.5 Watt	Qty: 1 $1 ea.
1−5/8"w x 1−1/8"d x 1−3/8"h	ArmacoAT-64 Transistor Driver Pri:100 Ω Sec: 200 C.T.	2 Watt	Qty: 1 $5

Transistor Output
3.2 Ω Transistor Output
7/8"w x 3/4"d x 11/16"h	ArmacoAT-51 Transistor Output Pri:500 Ω C.T. Sec: 3.2 Ω	12.5:1	NEW Qty: 1 $2
13/16"w x 5/8"d x 11/16"h	Hammond148T Transistor Output Pri:500 Ω C.T. Sec: 3.2 Ω	300 mW	NEW Qty: 5 $10 ea.
13/16"w x 5/8"d x 11/16"h	Hammond148T Transistor Output Pri:500 Ω C.T. Sec: 3.2 Ω	Hammond List $18.18
1−1/8" x 1−1/8" x 1"h	SanyoV207A Transistor Output Pri: 700 Ω Sec: 4 Ω	1 Watt	Qty: 1 $2
3/4"w x 5/8"d x 5/8"h	T-D-1003 Transistor Output Pri: 2000 Ω C.T. ( 70 Ω DC ) Sec:3.2 Ω( .1 Ω DC ) *** Impedance determined by measurement.	22:1	Qty: 1 $1
3/4"w x 3/4"d x 5/8"h	22600-21 Transistor Output Pri: 3000 Ω ( 36 Ω DC ) Sec:3.2 Ω ( .1 Ω DC ) *** Impedance determined by measurement.	22.7:1	Qty: 1 $1
8 Ω Transistor Output
3"w x 2−1/2d" x 2−1/8"h	Hammond105314 Transistor Output from McCurdy AD975 Amplifier Pri:8 Ω Sec: 4 / 16 Ω ( Two 8 Ω windings ) *** Impedance determined by measurement.	1:1:1	Qty: 1 $10
1−1/8"w x 1"d x 1"h	8392159 Transistor Output Pri: 18 Ω ( 1 Ω DC ) Sec: 8 Ω ( .5 Ω DC ) *** Impedance determined by measurement.	1.5:1 ≈ 1.5 Watt	Qty: 42+ $2 ea.
1−11/16"w x 1−3/16"d x 1−3/8"h	OPT3 Transistor Output from Automobile Radio Pri: 32 Ω ( 2.0 Ω DC ) Sec: 8 Ω ( 1.2 Ω DC ) *** Impedance determined by measurement.	2:1 ≈ 2 Watt	Qty: 1 $5
5/8"w x 5/8"d x 9/16"h	H3412K Transistor Output Pri: 50 Ω ( 1.8 Ω DC Resistance ) Sec: 8 Ω ( 0.5 Ω DC Resistance ) *** Impedance determined by measurement.	2.5:1	Qty: 1 $1 ea.
3/4"w x 5/8"d x 5/8"h	1479977-5 Transistor Output Pri: 50 Ω ( 4.6 Ω DC ) Sec: 8 Ω ( .3 Ω DC ) *** Impedance determined by measurement.	3:1	Qty: 1 $1
1-1/16"w x 3/4"d x 3/4"h	QLA-0330 Transistor Output Pri:100 Ω C.T. ( 5.2 Ω DC ) Sec: 8 & 1K Ω ( .5 & 438 Ω DC - 2 seperate windings ) *** Impedance determined by measurement.	3.3:1 1:3.4 ≈ 1 Watt	NEW Qty: 1 $2 ea.
3/4"w x 5/8"d x 9/16"h	OPT2 Transistor Output Pri:160 Ω C.T. Sec: 8 Ω *** Impedance determined by measurement.	4.5:1	Qty: 1 $1
1−1/16"w x 3/4"d x 3/4"h	Hammond149U Transistor Output Pri:150 / 600 Ω Sec: 8 Ω *** New except for being used temporarily in a prototype and leads cut shorter for Printed Circuit Board use.	1 Watt	Qty: 1 $10
1−1/16"w x 3/4"d x 3/4"h		Hammond List $18.18
9/16"w x 9/16"d x 7/16"h	OPT1 Transistor Output Pri:500 Ω Sec: 8 Ω *** Impedance determined by measurement.	7.5:1	Qty: 1 $1
1/2"w x 1/2"d x 3/8"h	427-506 Transistor Output Pri:600 Ω( 58 Ω DC ) Sec: 8 / 300 Ω ( 0.8 Ω DC ) *** Impedance determined by measurement.	8:1	Qty: 1 $1
5/8"w x 5/8"d x 9/16"h	OPT5 Transistor Output Pri: 600 Ω C.T. ( 34 Ω DC ) Sec:8 Ω( .5 Ω DC ) *** Impedance determined by measurement.	8.75:1	Qty: 1 $1 ea.
3/4"w x 5/8"d x 5/8"h	OPT4 Transistor Output Pri: 600 Ω C.T. ( 54 Ω DC ) Sec:8 Ω( .5 Ω DC ) *** Impedance determined by measurement.	11:1	NEW Qty: 1 $2
3/4"w x 5/8"d x 9/16"h	QLAT-0306 Transistor Output Pri:450 Ω( 49 Ω DC) Sec: 8 / 600 Ω ( 1 / 115 Ω DC, 1 winding with 8 Ω tap ) *** Impedance determined by measurement.	9.8:1 1:1.3	NEW Qty: 1 $2
Other Transistor Output
2¼"w x 2"d x 2"h 0.55kg	306991-1 / 7737048 Transistor Output from Ampex PA Amplifier Pri:1250 Ω C.T. (13 ohms DC) Sec: Tapped Winding with 4 leads that I'm guessing are for 0 - 4 - 8 - 16 ohms. *** 1250 Ω Impedance based on turns ratio and 8 Ω sec.	25.0:1 12.5:1 7.07:1	Qty: 2 $10 ea. 2/$15
3/4"w x 3/4"d x 11/16"h	L181FC Transistor Output Pri:500 ( 210 Ω DC Resistance ) Sec: 32 ( 12 Ω DC Resistance ) *** Impedance determined by measurement.	4:1	Qty: 2 $1 ea.
1-1/2"w x 1"d x 1-1/8"h	19B209079P1 Transistor Output that I believe is from a Heathkit Intercom with 40 Ω speakers that are also available. Pri:150 Ω ( .9 Ω DC ) Sec: 40 Ω ( .1 Ω DC ) *** Impedance determined by measurement.	4.1:1	Qty: 1 $1

Tube Output
	Sorry, All Tube Output Transformers have been Sold

70 Volt Line
1−15/16"w x 1−1/4"d x 1−3/8"h	94-0054 Power Taps: 4, 2, 1, ½, ¼ Watt Speaker Impedance: 4 / 8 Ω	4 Watt	Qty: 2 $8 ea.
1−15/16"w x 1−5/8"d x 1−5/8"h	Marsland53-192-2 Power Taps: 4, 2, 1, 0.5, 0.33, 0.25 Watt Speaker Impedance: 8 Ω 500g	4 Watt	NEW Qty: 1 $15

Misc.
	HP-342A / HP-349A Transformer T101 P/N: 9120-0034 0.37kg1-7/8" dia. x 2.5"h	Qty: 1 $5
	HP-236A Transformer T2 P/N: 9100-1310 0.13kg1-1/2"dia. x 1-1/2"h Ref. 236A Drawing	Qty: 2 $5 ea.

Items for Sale
Home Page

Amateur Radio
Home Page

sbszoo.com
Home Page

Audio Transformers

Shielded Transformers

600 Ω Input, Output & Line-to-Line

Modem & Telephone - 600 Ω

Input

Transistor Driver

Transistor Output

Tube Output

70 Volt Line

Misc.